Jeff McLane and Zach Berman

BETHLEHEM, Pa. -- DeSean Jackson injured his back after he caught a pass from quarterback Kevin Kolb in the afternoon portion of Saturday's training camp practice.

The Eagles gave the injury update after practice, but said Jackson was still being evaluated. About a half hour after the update, the receiver, who hasn't spoken to reporters since he arrived at Lehigh two days ago, walked out of the locker room on his own, got into his black Porsche and sped away without comment.

Teammates and Eagles sources were saying the injury wasn't serious. Judging by the way Jackson left the practice facility, they could be right.

Kolb was asked if his heart skipped a beat when he he saw his star wide receiver go down.

"Yeah, especially for a quarterback," Kolb said, before pausing. "Yeah, you definitely need him out there."

While Jackson injured his back, he also limped off the field favoring his right leg as he leaned on a trainer. He was then helped into a cart, wheeled off the field and to the locker room. He got out of the cart without assistance but walked very slowly indoors.

The play occurred during a no-pads 7-on-7 drill. Jackson pulled in a 12-yard pass in between cornerback Asante Samuel and linebacker Omar Gaither. There didn't appear to be any contact, but Jackson looked as if he had to twist awkwardly to catch the ball. He dropped to the turf, rolled over and stayed down for several seconds before the training staff ran to him.

As the trainers looked him over, Eagles coach Andy Reid came over to examine the scene. Jackson eventually got up, but he was wobbly and looked as if he might fall over again. He was visably disraught as he was carted away.